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How A Key Open The Lock+ @, S& M; s5 u
开锁原理: U3 c0 B8 y+ n
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硬币是怎样过滤分类的9 Q# B0 e5 k/ O' N, R! p. f* w
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缝纫机工作原理
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9 j, t* a1 _$ g9 l6 i/ QHow a Zipper Works3 {1 F9 M) {# F9 a9 Q E: W, y4 w z
拉链如何工作
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心脏的工作原理
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枪的工作原理
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How a Grenade Works
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- [1 a' j! F F7 zHow a Fan Works
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How are necklaces made9 @9 Z! P9 w% U* @
项链是怎么做的
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Chain making machines
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圈圈蝴蝶饼干
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奶油夹心饼干
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脆皮甜筒
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机智的发明
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